1. Imiqondo eyisisekelo
Ngokusekelwe kubuchwepheshe bokuqala be-LTE (Isikhathi Eside Evolution), uhlelo lwe-5G NR lusebenzisa ubuchwepheshe obusha nezakhiwo.I-5G NR ayigcini nje ngokuthola ifa le-OFDMA (i-Orthogonal Frequency-Division Multiple Access) ne-FC-FDMA ye-LTE kodwa izuza njengefa ubuchwepheshe be-multi-antenna be-LTE.Ukugeleza kwe-MIMO kungaphezu kwe-LTE.Ekushintshanisweni, i-MIMO isekela ukukhethwa okuguquguqukayo kwe-QPSK (i-Orthogonal Frequency-Division Multiple Access), i-16QAM (i-16 multilevel quadrature amplitude modude module), 64QAM (64 multilevel quadrature amplitude modude modude), kanye nama-256 QAM (256 multi-level amplitude quadrature modules). ukuguquguquka).
Uhlelo lwe-NR, njenge-LTE, lungakwazi ukwaba isikhathi nemvamisa kumkhawulokudonsa ngokuphindaphinda kokuhlukaniswa kwemvamisa kanye nokuphindaphinda kokuhlukaniswa kwesikhathi.Kodwa ngokungafani ne-LTE, i-NR isekela ububanzi obuguquguqukayo benkampani yenethiwekhi, obufana no-15/30/60/120/240KHz.Umkhawulokudonsa omkhulu wenkampani yenethiwekhi osekelwayo ungaphezulu kune-LTE, njengoba kukhonjisiwe esithombeni esingezansi:
| U | Isikhala se-sub-carrier | Inombolo yesikhala sesikhathi ngasinye | Inombolo yeslothi sesikhathi sozimele ngamunye | Inombolo yeslothi sesikhathi sozimele omncane ngamunye |
| 0 | 15 | 14 | 10 | 1 |
| 1 | 30 | 14 | 20 | 2 |
| 2 | 60 | 14 | 40 | 4 |
| 3 | 120 | 14 | 80 | 8 |
| 4 | 240 | 14 | 160 |
|
Isibalo setiyori senani eliphakeme le-NR sihlobene nomkhawulokudonsa, imodi yokumodulation, imodi ye-MIMO, namapharamitha athile.
Okulandelayo imephu yensiza yemvamisa yesikhathi
Igrafu engenhla imephu yensiza yemvamisa yesikhathi evela kudatha eminingi ye-LTE.Futhi ake sikhulume kafushane ngokubala kwenani eliphakeme le-5G nayo.
2. ukubalwa kwezinga eliphakeme le-NR downlink
Izinsiza ezitholakalayo kusizinda sefrikhwensi
Ku-5G NR, iyunithi yokushejula eyisisekelo ye-PRB yesiteshi sedatha ichazwa njengezinkampani zenethiwekhi eziyi-12 (ehlukile kune-LTE).Ngokomthetho olandelwayo we-3GPP, umkhawulokudonsa ongu-100MHz (isithwali esingaphansi esingu-30KHz) unama-PRB angu-273 atholakalayo, okusho ukuthi i-NR inama-273*12=3276 abathwali abangaphansi kusizinda samafrikhwensi.
Izinsiza ezitholakalayo kusizinda sesikhathi
Ubude besikhathi besikhathi buyafana ne-LTE, kusengu-0.5ms, kodwa endaweni ngayinye, kunezimpawu eziyi-14 ze-OFDMA, kucatshangelwa ukuthi insiza ethile idinga ukusetshenziselwa ukuthumela isignali noma ezinye izinto, kunezimpawu ezingaba ngu-11 ingasetshenziselwa ukudlulisa, lokhu kusho ukuthi cishe abathwali abangaphansi abayi-11 kwabangu-14 befrikhwensi efanayo edluliswa phakathi kuka-0.5ms basetshenziselwa ukudlulisa idatha.
Ngalesi sikhathi, umkhawulokudonsa ongu-100MHz (isithwali esingaphansi esingu-30KHz) ekudluliseni okungu-0.5ms ngu-3726*11=36036
Isakhiwo sohlaka (2.5ms umjikelezo okabili ngezansi)
Uma uhlaka lohlaka lulungiswa ngomjikelezo ophindwe kabili ongu-2.5ms, isilinganiso esikhethekile se-subframe time slot singu-10:2:2, futhi kukhona (5+2*10/14) izindawo zokuxhumanisa eziphansi phakathi kuka-5ms, ngakho inani lezikhala ze-downlink nge-millisecond ngayinye. cishe 1.2857.1s=1000ms, ngakho 1285.7 izikhala zesikhathi sokuxhumanisa phansi zingahlelwa phakathi kwe-1s.ngalesi sikhathi, inombolo yezinkampani ezingaphansi ezisetshenziselwa ukuhlela i-downlink ngu-36036*1285.7
Umsebenzisi oyedwa i-MIMO 2T4R ne-4T8R
Ngobuchwepheshe be-antenna eminingi, abasebenzisi besignali bangakwazi ukusekela ukudluliswa kwedatha yokusakaza okuningi ngesikhathi esisodwa.Inombolo ephezulu yokusakaza kwedatha ye-downlink ne-uplink yomsebenzisi oyedwa incike enanini elincane kakhulu lezendlalelo zokwamukela iziteshi eziyisisekelo kanye nezendlalelo ezithola i-UE, evinjelwa incazelo yephrothokholi.
Ku-64T64R yesiteshi esiyisisekelo, i-2T4R UE ingasekela ukusakazwa kwedatha okufika koku-4 ngesikhathi esisodwa.
Inguqulo yamanje ye-protocol ye-R15 isekela izendlalelo ezifinyelela kweziyisi-8;okusho ukuthi, inani eliphezulu lezendlalelo ze-SU-MIMO ezisekelwe ohlangothini lwenethiwekhi yizendlalelo ezingu-8.
Ukushintshwa kwe-oda eliphezulu 256 QAM
Inkampani yenethiwekhi eyodwa ingathwala amabhithi angu-8.
Ukufingqa, ukubala okunzima kwezinga eliphakeme lethiyori ye-downlink:
Umsebenzisi oyedwa: MIMO2T4R
273*12*11*1.2857*1000*4*8=1.482607526.4bit≈1.48Gb/s
Umsebenzisi oyedwa: MIMO4T8R
273*12*11*1.2857*1000*8*8≈2.97Gb/s
Isikhathi sokuthumela: Apr-26-2021